Comment 26 for bug 614699

@23: There is an easy way to get back to the official kubuntu-backports - use dpkg instead of apt-get. I suggest this way:

* delete my repository from the list
* sudo apt-get update
* dpkg-query --list '*qt*' | grep 4:4.7.0-beta2-gc01 | awk '{print $2}' > downgrade.qt
* mkdir qtdown && cd qtdown
* aptitude download $(cat downgrade.qt) -t lucid
* sudo dpkg -i *.deb

Because dpkg take no care of dependecies use this suggestion with care.